Working principle of Colloidal silica/Silica Sol with Large Particle Size

In the field of materials science and chemical engineering, colloidal silica (also known as silica sol) is a very important substance, especially colloidal silica with large particle size. Due to its unique physical and chemical properties, it is widely used in many industries such as coatings, ceramics, casting, rubber, etc.

Colloidal silica is a stable system formed by nanoscale particles dispersed in a liquid medium. The particle size of large-particle colloidal silica is usually greater than 100 nanometers. These particles are highly dispersed in the liquid to form a stable colloidal system. Large-particle colloidal silica has a large specific surface area and high surface energy, so it exhibits many unique physical and chemical properties.

The surface of large-particle colloidal silica particles carries an electric charge and can adsorb ions or molecules in the surrounding liquid. This adsorption allows a stable charge layer to be formed between the particles in the colloidal system, thereby preventing the particles from agglomerating. At the same time, there is a balance between van der Waals forces and electrostatic repulsion between the particles of large-particle colloidal silica, which keeps the particles highly dispersed in the liquid. Since large-particle colloidal silica has a large particle size, it can play a filling role in coatings, ceramic slurries and other systems. This filling effect can improve the density and mechanical strength of the system. At the same time, large-particle colloidal silica particles can also increase the viscosity of the system, play a thickening role, and make the system more stable. The surface of large-particle colloidal silica particles has a large number of hydroxyl groups (-OH) and other active groups, which can react chemically with other substances. Therefore, large-particle colloidal silica has a wide range of applications in the field of catalysis. In addition, large-particle colloidal silica can also be used as a catalyst carrier to improve the dispersion and stability of the catalyst.

Large-particle colloidal silica plays an increasingly important role in the fields of materials science and chemical engineering with its unique working principle and broad application prospects. With the continuous development of science and technology, the application field of large-particle colloidal silica will be more extensive.